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If you are running an older version, shut it down. Blocks will be stored on disk out of order in the order they are received, really , which makes it incompatible with some tools or other programs.
Reindexing using earlier versions will also not work anymore as a result of this. If you want to be able to downgrade smoothly, make a backup of your entire data directory.
Without this your node will need start syncing or importing from bootstrap. It is possible that the data from a completely synchronised 0. If you want to downgrade after you have done a reindex with 0. Depending on the platform, this means a significant speedup for raw signature validation speed.
In practice, this translates to a raw reindexing and new block validation times that are less than half of what it was before. A major part of the outbound traffic is caused by serving historic blocks to other nodes in initial block download state. It is now possible to reduce the total upload traffic via the -maxuploadtarget parameter. This is not a hard limit but a threshold to minimize the outbound traffic. When the limit is about to be reached, the uploaded data is cut by not serving historic blocks blocks older than one week.
Moreover, any SPV peer is disconnected when they request a filtered block. Whitelisted peers will never be disconnected, although their traffic counts for calculating the target. Between compatible peers, [BIP ] https: This means that blocks are advertised by announcing their headers directly, instead of just announcing the hash.
In a reorganization, all new headers are sent, instead of just the new tip. This can often prevent an extra roundtrip before the actual block is downloaded. There was no upper bound on the size of the mempool and attackers could send a large number of transactions paying just slighly more than the default minimum relay fee to crash nodes with relatively low RAM. A temporary workaround for previous versions of Bitcoin Core was to raise the default minimum relay fee.
The default value is MB and can be configured with the -maxmempool parameter. The initial minimum relay feerate is set to satoshis per kB. These limits can be overriden using command line arguments; see the extended help --help -help-debug for more information.
It is now possible to replace transactions in the transaction memory pool of Bitcoin Core 0. Moreover, a replacement transaction may only be accepted when it pays sufficient fee, as described in [BIP ] https: Transactions signaling replacement under BIP will still be allowed into the mempool in this configuration, but replacements will be rejected.
This option is intended for miners who want to continue the transaction selection behavior of previous releases. The -mempoolreplacement option is not recommended for wallet users seeking to avoid receipt of unconfirmed opt-in transactions, because this option does not prevent transactions which are replaceable under BIP from being accepted only subsequent replacements, which other nodes on the network that implement BIP are likely to relay and mine.
Note that the wallet in Bitcoin Core 0. This file is generated with random content when the daemon starts, and deleted when it exits. Its contents are used as authentication token. Read access to this file controls who can access through RPC. By default it is stored in the data directory but its location can be overridden with the option -rpccookiefile.
This calculation is used for relaying of transactions which do not pay the minimum relay fee, and can be used as an alternative way of sorting transactions for mined blocks. In Bitcoin Core 0. Transactions which do not meet this higher effective minimum relay fee will not be relayed or mined even if they rank highly according to the priority heuristic.
The mining of transactions based on their priority is also now disabled by default. Additionally, as a result of computational simplifications, the priority value used for transactions received with unconfirmed inputs is lower than in prior versions due to avoiding recomputing the amounts as input transactions confirm. External miner policy set via the prioritisetransaction RPC to rank transactions already in the mempool continues to work as it has previously.
Note, however, that if mining priority transactions is left disabled, the priority delta will be ignored and only the fee metric will be effective. This internal automatic prioritization handling is being considered for removal entirely in Bitcoin Core 0. Community direction on this topic is particularly requested to help set project priorities.
Starting with Tor version 0. Bitcoin Core has been updated to make use of this. This means that if Tor is running and proper authorization is available , Bitcoin Core automatically creates a hidden service to listen on, without manual configuration. Bitcoin Core will also use Tor automatically to connect to other.
This will positively affect the number of available. This new feature is enabled by default if Bitcoin Core is listening, and a connection to Tor can be made. It can be configured with the -listenonion , -torcontrol and -torpassword settings.
Bitcoind can now optionally asynchronously notify clients through a ZMQ-based PUB socket of the arrival of new transactions and blocks. By default, Bitcoin Core will use floating fees.
Based on past transaction data, floating fees approximate the fees required to get into the m th block from now. Sometimes, it is not possible to give good estimates, or an estimate at all. Furthermore, Bitcoin Core will never create transactions paying less than the current minimum relay fee. The wallet will now report a negative number for confirmations that indicates how deep in the block chain the conflict is found.
For example, if a transaction A has 5 confirmations and spends the same input as a wallet transaction B, B will be reported as having -5 confirmations. If another wallet transaction C spends an output from B, it will also be reported as having -5 confirmations. To detect conflicts with historical transactions in the chain a one-time -rescan may be needed. Unlike earlier versions, unconfirmed but non-conflicting transactions will never get a negative confirmation count.
Previously, every wallet transaction stored a Merkle branch to prove its presence in blocks. When loading a 0. This can reduce the disk usage from currently around 60 GB to around 2 GB. However, rescans as well as the RPCs importwallet , importaddress , importprivkey are disabled.
A value of 0 disables pruning. The minimal value above 0 is Your wallet is as secure with high values as it is with low ones. Higher values merely ensure that your node will not shut down upon blockchain reorganizations of more than 2 days - which are unlikely to happen in practice. In future releases, a higher value may also help the network as a whole: For further information about pruning, you may also consult the release notes of v0. BIP defines a service bit to allow peers to advertise that they support bloom filters such as used by SPV clients explicitly.
It also bumps the protocol version to allow peers to identify old nodes which allow bloom filtering of the connection despite lacking the new service bit. For the next major version it is planned that this restriction will be removed. Command line options are now parsed strictly in the order in which they are specified.
It used to be the case that -X -noX ends up, unintuitively, with X set, as -X had precedence over -noX. This is no longer the case. Like for other software, the last specified value for an option will hold. Monetary amounts can be provided as strings.
This can be an advantage if a JSON library insists on using a lossy floating point type for numbers, which would be dangerous for monetary amounts. The asm property of each scriptSig now contains the decoded signature hash type for each signature that provides a valid defined hash type.
The following items contain assembly representations of scriptSig signatures and are affected by this change:. For example, the scriptSig. Note that the output of the RPC decodescript did not change because it is configured specifically to process scriptPubKey and not scriptSig scripts. SSL support for RPC, previously enabled by the option rpcssl has been dropped from both the client and the server. This was done in preparation for removing the dependency on OpenSSL for the daemon completely.
If you are one of the few people that relies on this feature, a flexible migration path is to use stunnel. Ubuntu it can be installed with:. Another way to re-attain SSL would be to setup a httpd reverse proxy. This solution would allow the use of different authentication, loadbalancing, on-the-fly compression and caching. A sample config for apache2 could look like:.
The mining code in 0. However all blocks are still tested for validity after assembly. The list of banned peers is now stored on disk rather than in memory. Restarting bitcoind will no longer clear out the list of banned peers; instead a new RPC call clearbanned can be used to manually clear the list.
The new setban RPC call can also be used to manually ban or unban a peer. Detailed release notes follow. This overview includes changes that affect behavior, not code moves, refactors and string updates.
For convenience in locating the code changes and accompanying discussion, both the pull request and git merge commit are mentioned. As well as everyone that helped translating on Transifex.